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overhead garage storage -- guidance on span tables and default load values

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  1. #1
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    Default overhead garage storage -- guidance on span tables and default load values

    Hi All,


    Since garages don't have their own section, then I'm here


    Here is my first rough design using sketchup (yes, its very bad)





    I have three heavy duty storage units around my garage.


    I wanted to set up some beams/bearers and joists -- with some MDF covering for storage across the top


    My storage is probably 45kg/m2; with heavier items placed near the edges and lighter items in the middle. Its for storage static weight only. The items being sorted are either cardboard boxes, storage boxes or vacsack bags.


    I was using SmartFrame Design to come up with the suggested wood dimensions.


    I was using :
    1) floor bearer - end or trimmer supporting joist load only (single span)
    2) floor joist - WITHOUT ceiling (single span + overhang)


    FYI the bearers are about 2600mm long (1800mm spacing), and my joists are about 1800mm long with a 400mm overhang and either 450mm or 600mm spacing.


    with default values - joists - 120x35 (450mm) ; 120x45 (600mm); bearers 190x45 (all for MPG10)


    Given my storage values - should I:
    1) be using floor bearer/ floor joist as the selected member?
    2) should I adjust the load values? floor dead load (40kg/m2), floor live load (1.5kPa) and Floor point load (1.8kn) (default values are in brackets)


    3) do I need to have bearers on each of the ends that are on top of the storage unit?

    For the sake of "using what I have" - I have a lot of 70x35s; and no MDF boards as of yet.
    The items being sorted are either cardboard boxes, storage boxes or vacsack bags.
    item description length qty SUM of total length (m)
    H2 MPG10 70x35 1800 5 9
    2000 3 6
    3260 5 16.3
    70x35 Total 31.3
    70x45 990 8 7.92
    70x45 Total 7.92
    H3 F7 90x90 2380 2 4.76
    90x90 Total 4.76
    oregan 185x42 3260 5 16.3
    185x42 Total 16.3
    Grand Total 60.28



    Keen to hear your thoughts and feedback.


    p.s. my earlier post had malfunctioned in the posting and passed on the image payload.
    Attached Thumbnails Attached Thumbnails screenshot.2021-05-04-5-.jpg   screenshot.2021-05-06.jpg  
    Last edited by cptcherry; 7th May 2021 at 12:02 PM. Reason: added details on current wood supply

  2. #2
    Golden Member havabeer's Avatar
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    pics still aren't working, you may need to use the sites image uploader
    Remember if you don't sin, then Jesus died for nothing

  3. #3
    Community Moderator phild01's Avatar
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    Default

    ... or just use Opera browser, Chrome engine gives me grief with pics now.

  4. #4
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    Woo hoo - success!

  5. #5
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    Quote Originally Posted by phild01 View Post
    ... or just use Opera browser, Chrome engine gives me grief with pics now.
    I got it working

    Any advice on the default weights, or should I use ceiling span tables?
    Or any other suggestions, would be really helpful!

    You can tell me that I'm over cooking it ; ideally followed by some recommendations

  6. #6
    4K Club Member Marc's Avatar
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    You are using a 14.5mm ZPU-4 to kill a fly.

    Use what you have, the 'oregano' 190x45 for the "bearers" and 70x35 for the "joist"
    The test is like this:
    Place an oregano across on edge, make a loop with a rope and sit in the loop, then jump up and down. If the joist breaks, you clearly need to lose weight, no more Oregano Manoosh for you.
    Flex test: drive the car under the bearer and try to lift the car with a chain block and register the flex measuring the distance to the floor at each pull of the chain, until the bearer brakes. You can use the appropriate software to make a destructive test graph.

    Other suggestions: Just build the confounded contraption
    Science is never settled,
    it advances one funeral at the time.
    Max Planck

  7. #7
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    Quote Originally Posted by Marc View Post
    You are using a 14.5mm ZPU-4 to kill a fly.

    Use what you have, the 'oregano' 190x45 for the "bearers" and 70x35 for the "joist"
    The test is like this:
    Place an oregano across on edge, make a loop with a rope and sit in the loop, then jump up and down. If the joist breaks, you clearly need to lose weight, no more Oregano Manoosh for you.
    Flex test: drive the car under the bearer and try to lift the car with a chain block and register the flex measuring the distance to the floor at each pull of the chain, until the bearer brakes. You can use the appropriate software to make a destructive test graph.

    Other suggestions: Just build the confounded contraption
    LOL ok.
    err..
    are there any more accurate rules of thumb in these situations?
    I would prefer to be guided by standards -- i think that would mean reducing the load values which would simulate a more accurate situation?

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